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Table 2 
Average Pairwise Difference in the Pollutants Listed for Groups of Tribes Located in the Same EPA Administrative Region, Listed by Percentile
GroupingAverage Pairwise DifferenceNational Percentile
Region 4 (n = 2) 120 
Region 6 (n =11) 69 40 
Region 5 (n = 5) 62 50 
Region 8 (n = 4) 57 56 
Region 9 (n = 9) 57 66 
Region 10 (n = 11) 29 98 
GroupingAverage Pairwise DifferenceNational Percentile
Region 4 (n = 2) 120 
Region 6 (n =11) 69 40 
Region 5 (n = 5) 62 50 
Region 8 (n = 4) 57 56 
Region 9 (n = 9) 57 66 
Region 10 (n = 11) 29 98 

Note. Some EPA regions do not include any tribes with TAS-approved WQSs (see Figure 1).

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